symmetric vs symmetrical

symmetric and symmetrical both are adjectives.

Word	Noun	Adjective	Verb	Adverb
symmetric	No	Yes	No	No
symmetrical	No	Yes	No	No

As adjectives, symmetric and symmetrical are synonyms defined as:

symmetric and symmetrical: having similarity in size, shape, and relative position of corresponding parts

symmetric (adjective)	symmetrical (adjective)
having similarity in size, shape, and relative position of corresponding parts	having similarity in size, shape, and relative position of corresponding parts
	exhibiting equivalence or correspondence among constituents of an entity or between different entities